Interface interactions between insecticide carbofuran and tea waste biochars produced at different pyrolysis temperatures

S. S. Mayakaduwa, Meththika Vithanage, Anurudda Karunarathna, Dinesh Mohan, Yong Sik Ok

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Biochars showed a potential as adsorbents for organic contaminants, however, have not been tested for carbofuran, which has been detected frequently in water. This study provides evidences for the use of infused tea residue derived biochar for carbofuran removal. Biochars were produced at 300, 500 and 700 °C by slow pyrolysis and were characterized by proximate and ultimate analysis, FT-IR, SEM, BET and pore size distribution. Pyrolysis temperature showed a pronounced effect on biochar properties. The maximum carbofuran removal was achieved at pH 5. Freundlich and Temkin models best fit the equilibrium data. Biochars produced at 700 °C showed the highest sorption intensity. The adsorption process was likely to be a favorable chemisorption process with electrostatic interactions between carbofuran molecules and biochar surface. Acid-base interactions, electrophilic addition reactions and amide bond formations are the possible mechanisms of carbofuran adsorption. Overall, biochars prepared from tea waste can be utilized as effective adsorbents for removal of aqueous carbofuran.

Original languageEnglish
Pages (from-to)110-118
Number of pages9
JournalChemical Speciation and Bioavailability
Volume28
Issue number1-4
DOIs
Publication statusPublished - 2016 Jan 12
Externally publishedYes

Keywords

  • Black carbon
  • Chemisorption
  • Isotherm modeling
  • Pesticide
  • Slow pyrolysis

ASJC Scopus subject areas

  • Toxicology
  • Health, Toxicology and Mutagenesis
  • Chemical Health and Safety

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